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''Illaenus'' is a genus of trilobites from Russia and Morocco, from the middle Ordovician. Species included in this genus can reach a length of about . They are without glabella and without articulation of the tail. The cephalon has a high profile and recurved genal spines. Eyes are distant from the axis of the head, situated nearer to the edge.〔(Archive.org )〕〔( Fossil Museum )〕 ==Selected species== This genus includes about 50 species: *''Illaenus alveatus'' Raymond 1925 *''Illaenus auriculatus'' Ross, Jr. and Barnes 1967 *''Illaenus bayfieldi'' Billings 1859 *''Illaenus bucculentus'' Whittington 1963 *''Illaenus consimilis'' Billings 1865 *''Illaenus consobrinus'' Billings 1865 *''Illaenus crassicauda'' Wahlenberg 1826 *''Illaenus fraternus'' Billings 1865 *''Illaenus gelasinus'' Whittington 1965 *''Illaenus lacertus'' Whittington 1954 *''Illaenus marginalis'' Raymond 1925 *''Illaenus oscitatus'' Fortey 1980 *''Illaenus spiculatus'' Whittington 1963 *''Illaenus tauricornis'' (Kutorga 1848) *''Illaenus tumidifrons'' Billings 1865 *''Illaenus utahensis'' Hintze 1952 〔 (The Paleobiology Database )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Illaenus」の詳細全文を読む スポンサード リンク
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